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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4b30c676eefa35f06f731eaa081334f77312eede20366a27234423ae0122a9' 
  AND token = 'H0n3ggF0w9iiQURVNB7Gj39D2mo91D/DgKwYC6nP1eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}